[PATCH 1/2] blk-mq: add a blk_mq_submit_bio_direct API

[Keith Busch]

Looks good. Just a couple minor typo's in the commit message.

Reviewed-by: Keith Busch <kbusch at kernel.org>

On Mon, Mar 22, 2021 at 08:37:25AM +0100, Christoph Hellwig wrote:
> This adds (back) and API for simple stacking drivers to submit a bio to

                   an API

> blk-mq queue.  The prime aim is to avoid blocking on the queue freeze
> percpu ref, as a multipath driver really does not want to get blocked
> on that when an underlying device is undergoing error recovery.  It also
> happens to optimize away the small overhead of the curren->bio_list based

                                                     current->bio_list